***Georeferenced map images for VGS Bulletins, Environmental Series, and original surficial maps are on line at: http://geothermal.isgs.illinois.edu/ArcGIS/rest/services/aasggeothermal. Once at the site, click on the VT file name and you will be given options to download ArcGIS Explorer then view the files or to view files in ArcGis.com (this clickable link is recommended and will bring the map up), both are free from ESRI. AT the bottom of the page you can also create a kml file, then view in Google Earth. Many thanks to Melony Barrett at the Illinois GS "hub" and to the geothermal grant program through DOE and AZGS.